Carbureter.



W. F. SCHULZ.

CARBURETER.

APPLICATION FILED NOV.11,1910. 1,020,059. Patented Mar. 12, 1912 `2 SHEETS-sanm- 1.

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W. F. SCHULZ.

CARBURETER.

APPLLUATION FILED 11011.11, 1910.

1,020,059. Patented Mar.12,1912.

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WALTER F. SCHULZ, OF NEW YORK, N. Y.

GARBURETER.

Specification of Letters Patent.

Patented Mai. 12, 1912.

Application filed November 11, 1910. Serial No. 591,751.

To alt whom 'Lt may concern:

Be it known that I, Wai/rmi F. SCHULZ, of the city of New York. State of New York, have invented certain new and useful Improvements in Carbureters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled, in t-he art to which it. appertains to make and use the same.

My present invention contemplates the provision of improved means for controlling and accelerating the supply of fuel to a carbureter.

I provide means for withdrawing the atmospheric pressure from above the fuel on starting the engine to prevent too rich a mixture, and I also provide an air supply automatically controlled and conducted into the receptacle containing the fuel so that the atmospheric pressure acting upon the body of liquid will tend to promote its passage through the nozzle and thus maintain the proper proportion of fuel and air for high speeds.

As illustrated in the accompanying drawing, Figure l is a vertical longitudinal sectional view showing the preferred form of carbureter equipped with my improvements. Figs. 2 and 3 are sections on lines 2-2 and BH3 respectively, Fig. 1. Fig. 4 is a detail.

Referring to the drawing I have shown, as an appropriate form of embodiment, a carbureterv formed with a float chamber l containing a float 2 of the usual or any preferred construction. The function of this float is well understood in the art. Extending vertically through the float chamber is a hollow casing 3 to which a constant or primary supply of air is introduced as at 4, the casing being for this purpose open at its lower end and surrounded by a cup 5 secured to the central post 6 of the casing. The primary air supply passes up through the casing to the mixing chamber 7. 8 designates the nozzle shown vertically mounted wit-hin-` the casing and communicating throughports 9 with the interior of the float chamber 1. All of these parts are, or may be, of the usual or any preferred construction.

The secondary air supply valve is indicatedat 10, the casing above this valve being open as shown in Fig. 2. This puppet valve is shown having its stem 12 vertically movable within a depending casing or cylinder .13. A coil spring 14 tends to hold the valve to its seat.

The air pressure inlet port is indicated at 15. This port is shown formed in a cylindrical plug 1G axially movable within a circular casing 17 by means of a handle 18 to manually adjust the extent of the opening. I have shown the valve 10 provided with an upper extension or post 19 adapted to enter the port 15 to close the latter and thus operate as a valve for the air pressure supply. lVhen the valve 10 is unseated the secondary air supply is established and this air passes the valve and enters the mixing chamber 7. At the same time valve 19 is removed from port 15 and the air pressure supply is established. This enters a passageway 20 leading to the top of the float chamber 1, so that the pointl at which it enters the float chamber will be above the level of the liquid fuel. l have also shown the air passage 20 in communication with the mixing chamber through a port 21 which latter is controlled by a manually operated valve 22 extending across the mixing chamber and through the wall of the casing and provided with a handle Q3 at its outer end.

24 designates the throttle within the mixing chamber.

In practice, when the engine is started the initial air supply entering at 4 passes up 'through the casing 3 and combines with the fuel issuing from the nozzle 8. The mixture then passes through the mixing chamber 7 and past the throttle to the engine. Owing to the atmospheric pressure within the fuel receptacle, however. the fuel is ordinarily too rich in starting the engine as the pressure forces too much fuel into the nozzle. To overcome this ditliculty the valve Q2 is maintained slightly removed from its seat so that there may be constant communication between the mixing chamber 7 and the float chamber 1 through the passage 20. As the engine starts, the suction within the mixing chamber will be communicated to the fioat chamber, lessening the atmospheric pressure in the float chamber and consequently preventing too rich a mixture. As the engine speeds up valve 10 is drawn from its seat. admitting the secondary air supply to the mixing chamber. At the same time valve 19 opens port 15 and the air pressure supply entering atthat point goes through passage 20 to the floatreceptacle where it acts upon the liquid proportion tothe air.

' The advantages of my invention will be vapparent-to those skilled in the art. By the the supplyof fuelto maintain-thenecessa-ry -form of embodiment-of my invention, yet l it will be notedth'at it is notnecessary tor fuel and tends to force it through ports 9 of the nozzle thereby increasing the fuel in constructiondescribed and the automatic eontrol,.l am enabled to lessen orl increaseV supply Vthereof jin proportion lto the engine speed.

While I have-illustrated the preferred cation with a mixing chamber andwith the nozzle of a carbureter. 4 I claim as my invention l.l A carbureter havinga fuel receptacle,l

a secondary air admitting means, means for i automatically controlling said-secondary air supply, and means operated-thereby for admitting air pressure to said fuell receptacle.

2. A carbureter having a fuel receptacle, an air pipe leading thereto,a valve governingthe passage of air through said pipe, 4a se'condaryair admitting valve, and means for'operating said former valve by said seey ondary air valve.

8. In a CaIbu'reter, av fuel receptacle hav-v ing an. air .inlet passage, an axially adjustable plug valvefin said passage formed with t a transverse port, and va secondary air valve carrying a post adapted to normally close sald port.

ln testimonyy whereof, I have signed this scrihiug witnesses.

specification' in the presence of two sub- -Witnessesz SILAS SNOW, HARRY A. CROSBY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, n. c. 

